I've been looking into designs for vibration mountings using a liquid silicon bed. Like the consistency of a gummi bear that's been sitting in a warm place. I think this would work where you have a piece of equipment and you don't want to transfer vibrations to a base structure. I.e. skid mounted pump units that are mounted on other equipment, like oil & gas drilling platforms, ship's hulls, etc. But when it comes to a telescope you want some inherent stability in the mountings. So my design won't work. I think you want some anti vibration pads of around 25 - 30 Shore A hardness. Urethane is probably OK for what you want to do.
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